Ink.



Unrrnn STATES PATENT OFFICE.

ROBERT HOCHSTETTER, OF CINCINNATI, OHIO.

INK.

Original application filed October 13, 1905, Serial No. 282,592."Divided and this application filed October 19, 1905.

Specification of Letters Patent.

Serial No. 283,472.

To all whom it may concern:

Beit known that I, ROBERT HoonsTE'rTER, a citizen of the United States,and a resident of Cincinnati, in the county of Hamilton, and State ofOhio, have invented a certain new and useful Improvement in Ink, ofwhich the following is a full, clear, and exact description. I

My improvement relates to inks to be used in an oscillating mimeograph,or machine of similar character.

The object of my invention is to produce an ink which will remain moiston the pad, while at the same time it shall have the qliliality ofdrying rapidly on the sheet, so t at after each operation of themimeograph, the printed sheets may fall one upon the other withoutdanger of smudging.

The difficulty with the inks at present in use is that when a quickdrying ink is'used, so that it dries rapidly on the paper, it dries withequal rapidity in the pad and waxed stencil, and clogs them, thuspreventing the ready flow of ink through the pad and stencil. On theother hand, when a slow drying ink is used, although it will not clogthe pad and Waxed stencil, and will freely flow through them, it driesso slowly on the paper that the printed sheets can not be thrownimmediately after each operation, one upon the other, because theinkbeing moist, will cause the sheets to smudge.

Many inks have been tried with an effort to overcome the abovedifliculty. For example, mimcograph ink consisting of thin printers inkmixed with Vaseline has been used with an ordinary hand mimeograph,butthis ink cannot be used on an oscillating mimeograph for the reason thatit will not draw evenly and continuously through the pad by means ofcapillary attraction, as is necessary such a machine, and will leave anoily outline to the letters on the paper. Again printers ink has beenmixed with an emulsion of glycerin and borax (borated' glycerin), orother alkaline agents and glycerin. This ink Will draw through the pad,but will dry slowly on the paper. My improved ink is especially adaptedfor use in an oscillating mimeograph, in which the ink is drawn into thepad and through the waxed stencil by means of capillary attraction.

ing a species of the genus described in my application Serial Number86,002, filed December 14th, 1901, for improvement in Inks. In carryingout my invention, I grind the pigment in a mixture of glycerin andTurkeyred oil.

As a specific example of my improved ink, I give the followingproportions :-Take 49% parts by weight of inorganic blue pigment made by20 parts milori blue and 80 parts barium. sulfate, and 42% parts byweight of glycerin. Grind this together until perfectlyfree from grit.To the above addllll; parts by weight of Turkey red oil and 54 parts byweight of glycerin. This produces the ink. The body of the ink, asdescribed,

- can readily be changed by increasing the pigment or the vehicle as thecase may require. As for example, for very warm climates, more pigmentmust be used; otherwise the resulting ink would be too thin. Milori blueis a ferric-ferro cyanid salt and of the same family as Prussian blue,Chinese blue, etc.

The use of the Turkey red oil increases the rapidity with which the inkwill dry upon the paper, and appears simply to draw the ink right intothe paper. With glycerin alone this would not be the case, its actionbeing slower than the Turkey red oil. Turkey red oil is derived fromcastor oil, and its essential quality is that it will readily mix withglycerin and never settle from, or settle out, on standing. Othersulfonated oils have this characteristic, and can be used in the lace ofTurkey red oil. I therefore do not limit myself to the use of Turkey redoil.

I find that the ink thus produced not only flows easily and readilythrough the pad without clogging, but dries rapidly on the 'paper,thereby fulfilling the requirements of an ink to be used on oscillatingmimeographs.

Having thus described my invention, what I- desire to claim as new andto cover by Letters Patent is 1. An improved ink consisting of aninorganic pigment ground in a mixture of glycerin and a sulfonated oil,substantially as specified.

2. An improved ink consisting of an inglycerin, ground in amixture ofglycerin and organic ignient ground in amixture of glyc- Turkey red oil,substantially as and for the erin an Turkey red oil, substantially asdepurpose specified scribed. ROBERT HOOHSTETTER. 5 3. An improved inkconsisting of an in Witnesses:

organic pigment constructed on a base which CLARENCE E. MEHLHQPE,

will not enter into a'chemical reaction with JOSEPH R. ROHRER.

